<!DOCTYPE html>
<html lang="zh-CN">
	<head>
		<meta charset="UTF-8" />
		<meta name="viewport" content="width=device-width, initial-scale=1.0" />
		<title>003-并集选择器</title>
		<style>
			/* h1,
			p,
			div {
				color: red;
			} */

			h1,
			.my-p,
			div.my-div {
				color: blue;
			}
		</style>
	</head>
	<body>
		<h1>我是H1</h1>
		<p class="my-p">我是P</p>
		<div class="my-div">我是div</div>
	</body>
</html>
